Python网络编程（七）-标准库socketserver开发服务端，客户端网络应用

1. socketserver简介：

python3提供了标准库socketserver，用于创建服务端，客户端网络程序。它对socket进行了封装，用起来更加方便，简单。

2.举例：一个简单的C/S架构程序：

程序清单：

socketserver端：my_socketserver_s.py

#!/usr/bin/env python
import socketserver
from time import ctime

HOST = 'localhost'
PORT = 2222
ADDRESS = (HOST, PORT)


class RequestTCPHandler(socketserver.baseRequestHandler):
    def handle(self):
        print('...connected from:', self.client_address)

        try:
            while True:
                self.data = self.request.recv(1024)
                print("send:".format(self.client_address), self.data, ctime())
                if not self.data:
                    print("connection fail")
                    break
                self.request.sendall(self.data)
        except Exception as e:
            print(self.client_address, "disconnection")
        finally:
            self.request.close()

    def setup(self):
        print("create connection：", self.client_address)

    def finish(self):
        print("finish!")


if __name__ == "__main__":
    print('socket server main begin...')
    server = socketserver.TCPServer(ADDRESS, RequestTCPHandler)
    server.serve_forever()

RequestTCPHandler用于接受客户端发送过来的请求，并且进行处理。用request.sendall进行数据的发送。

创建一个TCPServer，其中，第一个参数是ip地址，第二个参数时RequestTCPHandler的实例。

客户端程序：my_socketserver_c.py

#!/usr/bin/env python
import socket

HOST = 'localhost'
PORT = 2222
ADDRESS = (HOST, PORT)


def connect(address):
    print('socket client main begin...')
    myClient = socket.socket()
    myClient.connect(address)

    while True:
        cmd = input("(q退出)%").strip()
        if len(cmd) == 0:
            continue
        if cmd == "q":
            break
        myClient.send(cmd.encode())
        res = myClient.recv(1024)
        print(res.decode())
    myClient.close()


if __name__ == "__main__":
    print('socket client main begin...')
    connect(ADDRESS)

标准的socket客户端程序：

创建socket->建立连接->send->recv,

当输入q时，结束程序。

运行结果如下：

socketserver端运行结果：

socket server main begin...
create connection： ('127.0.0.1', 52653)
...connected from: ('127.0.0.1', 52653)
send: b'abc' Thu Sep 23 11:10:00 2021
send: b'12345' Thu Sep 23 11:10:02 2021
send: b'' Thu Sep 23 11:10:04 2021
connection fail
finish!

client端运行结果：

python mysocket_server_c.py
socket client main begin...
socket client main begin...
(q退出)%abc
abc
(q退出)%12345
12345
(q退出)%q

Process finished with exit code 0
 

server，client